Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefd39b00044caa4…

MALICIOUS

PDF

73.0 KB Created: 2021-05-16 02:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3338f35f0777fcb38b30b118cc48f040 SHA-1: dbc317004f3f67f6c965b8f3a55133c58285da31 SHA-256: fefd39b00044caa4a956e714a6227ce83b0c9bf418225c94d73643555f4cb744
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is designed to host many links on disposable domains, often used for distributing malware or conducting phishing campaigns. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=what+makes+humans+human+according+to+leakey
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/1277329.pdf
    • https://cdn.sqhk.co/joxesinejag/HGjbfmk/soperebinave.pdf
    • http://metazexepajesen.22web.org/mikezigapabe.pdf
    • http://verifybadgehelp.com/wivuxezexm7q7.pdf
    • https://cdn-cms.f-static.net/uploads/4481990/normal_60259308010e6.pdf
    • https://cdn-cms.f-static.net/uploads/4420608/normal_603e0ce7e798c.pdf
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/6142f98a35d.pdf
    • https://cdn.sqhk.co/zogameva/2QiiXii/93947302202.pdf
    • https://cdn.sqhk.co/gotakavapu/cjdtjaE/lost_echo_resonance_release_date.pdf
    • http://novonet.online/xudapulajopoxufadimisilvd0nn.pdf
    • https://gekibevuzoz.weebly.com/uploads/1/3/4/5/134503907/4286db3c19.pdf
    • http://internet-babki.ru/gepalizy7kb.pdf
    • http://prodit.space/556429594080p2ad.pdf
    • https://static.s123-cdn-static.com/uploads/4413462/normal_5ff273653316b.pdf
    • https://cdn.sqhk.co/barugogip/ahaidxL/emoji_art_copy_and_paste_dirty.pdf
    • https://cdn.sqhk.co/gonolesuzam/ejjgche/93102098776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wemixapaw.epizy.com/tojuzebugagazunatopanoko.pdf
    • http://satoposip.epizy.com/ordering_decimals_percents_and_fractions_worksheets.pdf
    • http://pogudex.epizy.com/6017721492.pdf
    • http://zosonigileg.rf.gd/681815581.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e121.bin
96dc9abda1b2cc019f205d072233efb65fa80490b02f22e0c321142543552a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 5532 bytes
font_01_sfnt_off0000f3d6.bin
42d85b7ce4b84405e0fcbd5ec8bc9b6106bc5b89c551998768a67d764712de2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 10272 bytes

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